I've started interpreting a lot of these "Why we use X" posts as less 'bragging' and more these companies trying to justify their own choices. In part because it perhaps makes them feel less isolated in their choices, and in part also because by hoping that others follow them they'll find it easier to recruit, something that is easily underestimated especially outside of major hubs such as NY, SF, or London.

Perhaps I am being uncharitable. I note with interest they say, "However, we had a strong aversion to using Java itself", but don't explain why they had that aversion, or whether it was based on anything but the fact that Java isn't trendy.